Apparatus for the complete combustion of solid fuel.



No. 809,322. PATENTED JAN. 9, 1906.

' A. PFEIPER.

APPARATUS FOR THE COMPLETE COMBUSTION OF SOLID FUEL.

APPLIOATION TILED MAR.17, 1904.

UNITED STATES PATENT oFFIoE.

APPARATUS FOR THE COMPLETE COMBUSTION OF SOLID FUEL.

Specification of Letters Patent.

Patented Jan. 9, 1906.

Application filed March 17, 1904- Serial No. 198,681.

To all whom it may concern:

Be it known that I, ADAM PFEIFER, a subject of the Emperor of Germany, residing at 5 Schwalmerstrasse, Frankfort-on-the-Main, in the Empire of Germany, have invented certain new and useful Apparatus for the Complete Combustion of Solid Fuel, of which the following is a specification.

This invention relates to an apparatus for the complete combustion of solid fuel.

Although the conditions necessary for the complete and economic combustion of solid fuel are well known, the smoke generally emitted from boiler-chimneys shows how little this knowledge has been carried into practical effect, The emission of smoke, however, is only a partial indication of the actual incompleteness of the combustion elfected in the ordinary furnace, as carbureted hydrogen and carbonic oxid, which are also emitted, are invisible.

The invention is illustrated in a practical embodiment as applied to the furnace of a steam-generator in Figures 1, 2, and 8, which figures are respectively longitudinal sectional elevation and sectional elevation and sectional plan of the furnace of a steam-generator. Fig. 1 is a central sectional elevation through the furnace-grate and center flue. Fig. 2 is on the left-hand side a transverse section,

through the center and side flue and in the right-hand side a transverse section through the furnace-grate, while Fig. 3 is a sectional plan through the furnace fire-bridge and side and center flues.

According to the construction illustrated in Figs. 1 to 3 the fire-gases are divided into two currents II. and II The current II combines at c with the inflammable gas I, and inasmuch as a fresh supply of preheated air III- enters at this place the following can be observed: The currents I and III form a gasand-air mixture, which consists of air, fine particles of fuel, carbonic oxid, and carbureted hydrogen. The gas-and-air mixture burns as a flame under the influence of the hot inflammable fire-gas of the current II, which mostly consists of carbonic-acid gas. The gas-current V, which now contains principally carbonic-acid gas and carbonic-oxid gas, meets the gas-current IV at d. The gas-current IV mostly consists of hot carbonic-acid gas and is combined with a supplementary supply of air III, which enters behind the grate a I) at e. As at cl a non-inflammable hot gas V meets with hot gas containing a surplus of air, another combustion process takes place, and the resulting united current of gases is free from combustible matters.

Figs. 1 to 3 illustrate the application of the invention only to the furnace of a steam-generator; but it will be understood that the invention is generally applicable, for example, to the furnaces of cooking-stoves and stoves for apartments.

In carrying the invention into effect, as illustrated in Figs. 1 to 3 of the accompanying drawings, a grate is provided formed of two parts f and g. The conversion of the fuel into coke takes place on the part f, and the burning of the coke is effected on the part g. The division of the non-inflammable gas from the part g of the grate is effected in the provision of three outlet-holes h, c, and 7a. The gas-current II passes through the outlet-hole 6, while the gas-current IF passes through the outletholes it and 7c. The gas emanating from the fuel upon the part f of the grate passes through the conduits Z and m to the combustion-spaces c c, in which it meets with the gas of the current II, which passes through the openings 7i and 7a. For effecting the combustion in the combustion-spaces c c preheated warm applies to the constructional details and arrangement of the boiler.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a furnace in combination, a grate, a main flue in the rear of said grate, combustionspaces beside said main flue, air-inlets for said combustion-spaces, and air-inlets behind said grate into said main flue, said combustionspaces having apertures communicating with said main flue, substantially as described.

2. A furnace consisting in combination of a grate composed of two parts, a front part inclined toward the rear and a horizontal part, a bridge above said horizontal part, transversely disposed in said furnace, a central main flue beneath said bridge and behind said grate, apertures in said bridge, lateral combustion-spaees beside said main flue with which to this specification in the presence of two subthe apertures 1n the bridge communicate, alrsci-lbing witnesses.

inlets for said combustion-spaces, air-inlets ADAM PFEIFER for the main flue, and an extended combustion- 5 space in the rear of said first-named lateral l/Vitnesses:

combustion-spaces substantially as described. PAUL BAIG,

In testimony whereof I have signed my name JEAN GRUND. 

